97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
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#include "./framebuffer.h"
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#include <assert.h>
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#include <stddef.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <GL/glew.h>
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#include "./texture.h"
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void gleasy_framebuffer_initialize(
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gleasy_framebuffer_t* fb, int32_t width, int32_t height, int32_t samples) {
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assert(fb != NULL);
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assert(width > 0);
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assert(height > 0);
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assert(0 < samples && samples < GL_MAX_SAMPLES);
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*fb = (typeof(*fb)) {
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.width = width,
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.height = height,
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};
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glGenRenderbuffers(1, &fb->colorbuf_msaa);
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glBindRenderbuffer(GL_RENDERBUFFER, fb->colorbuf_msaa);
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glRenderbufferStorageMultisample(
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GL_RENDERBUFFER, samples, GL_RGBA, width, height);
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assert(glGetError() == GL_NO_ERROR);
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glGenTextures(1, &fb->colorbuf);
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glBindTexture(GL_TEXTURE_2D, fb->colorbuf);
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glTexImage2D(GL_TEXTURE_2D,
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0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, NULL);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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assert(glGetError() == GL_NO_ERROR);
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GLuint fbo[2];
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glGenFramebuffers(2, fbo);
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fb->id_msaa = fbo[0];
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fb->id = fbo[1];
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glBindFramebuffer(GL_FRAMEBUFFER, fb->id_msaa);
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glFramebufferRenderbuffer(GL_FRAMEBUFFER,
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GL_COLOR_ATTACHMENT0, GL_RENDERBUFFER, fb->colorbuf_msaa);
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assert(glGetError() == GL_NO_ERROR);
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glBindFramebuffer(GL_FRAMEBUFFER, fb->id);
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glFramebufferTexture2D(GL_FRAMEBUFFER,
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GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->colorbuf, 0);
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assert(glGetError() == GL_NO_ERROR);
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}
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void gleasy_framebuffer_deinitialize(gleasy_framebuffer_t* fb) {
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assert(fb != NULL);
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GLuint fbo[] = {fb->id_msaa, fb->id};
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glDeleteFramebuffers(2, fbo);
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glDeleteTextures(1, &fb->colorbuf);
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glDeleteRenderbuffers(1, &fb->colorbuf_msaa);
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}
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void gleasy_framebuffer_bind(const gleasy_framebuffer_t* fb) {
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assert(fb != NULL);
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glBindFramebuffer(GL_FRAMEBUFFER, fb->id_msaa);
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if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
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fprintf(stderr, "gleasy: framebuffer is in invalid state\n");
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abort();
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}
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}
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void gleasy_framebuffer_flush(const gleasy_framebuffer_t* fb) {
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assert(fb != NULL);
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gleasy_framebuffer_flush_to_other(fb, fb->id);
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}
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void gleasy_framebuffer_flush_to_other(const gleasy_framebuffer_t* fb, GLuint id) {
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assert(fb != NULL);
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glBindFramebuffer(GL_DRAW_FRAMEBUFFER, id);
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glBindFramebuffer(GL_READ_FRAMEBUFFER, fb->id_msaa);
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glBlitFramebuffer(
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0, 0, fb->width, fb->height,
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0, 0, fb->width, fb->height,
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GL_COLOR_BUFFER_BIT,
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GL_NEAREST);
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assert(glGetError() == GL_NO_ERROR);
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}
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